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A Finite Element Modeling Method for Establishing Material Models Containing Defects

A material model and modeling method technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as difficult to establish complex geometric structure models with a large number of defects, to overcome incompatibility, simple operation, The effect of reducing cumbersomeness

Active Publication Date: 2018-08-24
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of finite element modeling method that establishes the material model that contains defect, the defect in the model is simplified into circular hole or gap, and the generation procedure of the data model that establishs defect sample by mathematical software generates defect sample The data model of the defect sample is imported into the defect-free material model to generate a material model with defects, and finally a model with defect materials is formed, which solves the problem that it is difficult to establish a complex geometric structure model with a large number of defects

Method used

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  • A Finite Element Modeling Method for Establishing Material Models Containing Defects
  • A Finite Element Modeling Method for Establishing Material Models Containing Defects
  • A Finite Element Modeling Method for Establishing Material Models Containing Defects

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Embodiment 1

[0059] figure 2 is the defect-containing material model established in Embodiment 1 of the present invention.

[0060] The finite element modeling method of this embodiment is as follows:

[0061] (1) Simplify the pore shape in the defect material to obtain the defect sample.

[0062] The pore shape of the defective material presented by the scanning electron microscope was observed to be irregular and nearly circular, and it was simplified into a two-dimensional circular hole to obtain a defect sample.

[0063] (2) Establish a program for generating data models of defect samples in the command window of MATLAB software.

[0064] Define the pore parameters: the pore distribution range is [0,100:0,50]; the pore shape is a two-dimensional circle, the pore size parameters are the minimum pore radius of 1 μm, the maximum pore radius of 1 μm; the porosity is 0.05. Define the two-dimensional thermal barrier coating material whose defect material parameter is 100μm*50μm. Define ...

Embodiment 2

[0098] image 3 is the defect-containing material model established in Embodiment 2 of the present invention.

[0099] The method of establishing a two-dimensional finite element model of a material with randomly distributed linear cracks is as follows:

[0100] (1) Write the program in the command window of MATLAB software.

[0101] Introduction to procedure 2: The linear cracks are distributed in 100μm*50μm. Here, the maximum half length of the crack is 2μm, the minimum half length is 1μm, and the number of cracks is 20. It is assumed that the two straight line cracks do not intersect.

[0102] (2) Import the extracted data into ANSYS, the specific steps and operations are the same as the steps (2) to (4) in the first embodiment.

[0103] (3) input order in ANSYS software, operation step is with the step (5) (6) (7) (9) in the embodiment one; Concrete order is as follows:

[0104] Input command 1: *dim, dd, table, row number, column number (click the Enter key)

[0105] ...

Embodiment 3

[0119] Figure 4 It is the defect-containing material model established in the third embodiment of the present invention.

[0120] The method of establishing a two-dimensional finite element model of a material with randomly distributed linear cracks is as follows:

[0121] (1) Write the program in the command window of MATLAB software.

[0122] Introduction to program 3: Create a three-dimensional material of 100μm*50μm*50μm, randomly distribute three-dimensional circular holes, here the maximum radius of the pores is 1μm, the minimum radius is 1μm (for convenience, you can modify it yourself), the porosity is the ratio of the pores to the total material The proportion of the volume is 5%, assuming that the two circular holes do not intersect.

[0123] (2) Import the extracted data into ANSYS, the specific steps and operations are the same as the steps (2) to (4) in the first embodiment.

[0124] (3) input order in ANSYS software, step and operation are as follows with ste...

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Abstract

The invention provides a finite element modeling method for establishing a defective material model. The finite element modeling method comprises the following steps: establishing a two-dimensional or three-dimensional material model with great numbers of randomly distributed pores or cracks by virtue of combination of mathematical software, modeling software, finite element analysis software and the like: editing codes in the mathematical software to establish a data model of the material; carrying out defect treatment in the modeling software; and carrying out analog computation and result analysis in the finite element analysis software. According to the finite element modeling method, the problem that the material model with randomly distributed defects is difficultly established in the finite element analysis software is solved; by simplifying the great numbers of defects in the material, editing a reasonable script file and establishing interfaces among the software, the material model with great numbers of defects is introduced into the finite element analysis software to be subjected to analog computation, thereby facilitating the mastering and the use of relevant researchers.

Description

technical field [0001] The invention relates to the technical field of finite element modeling, in particular to a finite element modeling method for establishing a material model containing defects. Background technique [0002] Finite element analysis is a modern calculation method developed rapidly for structural mechanics analysis, and is widely used to solve problems such as heat conduction, electromagnetic field, and fluid mechanics. The software compiled based on the finite element analysis algorithm is the so-called finite element analysis software. The finite element software has a wide range of applications, and can be used in various scientific research and engineering technology fields such as machinery manufacturing, civil engineering, material processing, electronic appliances, aerospace, national defense and military industry, automobiles, ships, railways, petrochemicals, energy, bridges, and meteorology. . Among them, ANSYS software and ABAQUS software are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 杨丽朱旺齐莎莎周益春
Owner XIANGTAN UNIV
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